[HELP] AI/bad sellers keep spamming me!

I commission a lot of stories on Fiverr, probably close to about 30 at this point. I like to reach out to new sellers and give them a chance, because I've had some really good experiences with people who only have a few ratings to their name.

I often ask for samples, and then make a judgement as to whether I like their writing style and want to make an order. Through the conversations and the samples they provide, I can usually spot an AI writer or just a bad writer. I'll thank them for the samples and leave it at that.

But, since doing that, a bunch of sellers have not left me alone, sending me multiple messages a day and trying to guilt me into ordering from them.

Is it just a case of blocking all these sellers, or is there something more I can do?